From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@freedesktop.org
Subject: [Bug 100289] 'flip queue failed in radeon_scanout_flip: Invalid
 argument' error and small frame buffer allocated on turning off and on new
 monitor
Date: Sun, 04 Feb 2018 18:24:50 +0000
Message-ID: <bug-100289-502-8JlX8MOSaj@http.bugs.freedesktop.org/>
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--15177686901.4Ae8.21396
Date: Sun, 4 Feb 2018 18:24:50 +0000
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Auto-Submitted: auto-generated

https://bugs.freedesktop.org/show_bug.cgi?id=3D100289

--- Comment #14 from OmegaPhil@startmail.com ---
After messing around with this on and off for months, I have found that the
radeon_scanout_flip error is irrelevant - when the third monitor is turned =
off
and on, sometimes DisplayPort-0 is reported as Disconnected and then Connec=
ted
- through monitoring the root window (xev -root), I can finally get into a
useful X events stream:

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

RRScreenChangeNotify event, serial 114, synthetic NO, window 0x4bc,
    root 0x4bc, timestamp 332828415, config_timestamp 386328254
    size_index 65535, subpixel_order SubPixelHorizontalRGB
    rotation RR_Rotate_0
    width 5760, height 1200, mwidth 1526, mheight 318

RRNotify event, serial 114, synthetic NO, window 0x4bc,
    subtype XRROutputChangeNotifyEvent
    output DisplayPort-0, crtc 79, mode 1920x1200 (1920x1200)
    rotation RR_Rotate_0
    connection RR_Disconnected, subpixel_order SubPixelHorizontalRGB

RRScreenChangeNotify event, serial 115, synthetic NO, window 0x4bc,
    root 0x4bc, timestamp 332828415, config_timestamp 386328254
    size_index 65535, subpixel_order SubPixelHorizontalRGB
    rotation RR_Rotate_0
    width 5760, height 1200, mwidth 1526, mheight 318

RRNotify event, serial 115, synthetic NO, window 0x4bc,
    subtype XRRCrtcChangeNotifyEvent
    crtc 79, mode None, rotation RR_Rotate_0
    x 0, y 0, width 0, height 0

RRNotify event, serial 115, synthetic NO, window 0x4bc,
    subtype XRROutputChangeNotifyEvent
    output DisplayPort-0, crtc None, mode None
    rotation RR_Rotate_0
    connection RR_Disconnected, subpixel_order SubPixelHorizontalRGB

ConfigureNotify event, serial 115, synthetic NO, window 0x4bc,
    event 0x4bc, window 0x4bc, (0,0), width 5760, height 1200,
    border_width 0, above 0x0, override NO

RRScreenChangeNotify event, serial 117, synthetic NO, window 0x4bc,
    root 0x4bc, timestamp 386328636, config_timestamp 386328813
    size_index 65535, subpixel_order SubPixelHorizontalRGB
    rotation RR_Rotate_0
    width 5760, height 1200, mwidth 1526, mheight 318

RRNotify event, serial 117, synthetic NO, window 0x4bc,
    subtype XRROutputChangeNotifyEvent
    output DisplayPort-0, crtc None, mode None
    rotation RR_Rotate_0
    connection RR_Connected, subpixel_order SubPixelHorizontalRGB

RRScreenChangeNotify event, serial 117, synthetic NO, window 0x4bc,
    root 0x4bc, timestamp 386328636, config_timestamp 386328813
    size_index 65535, subpixel_order SubPixelHorizontalRGB
    rotation RR_Rotate_0
    width 3840, height 1200, mwidth 1016, mheight 318

ConfigureNotify event, serial 117, synthetic NO, window 0x4bc,
    event 0x4bc, window 0x4bc, (0,0), width 3840, height 1200,
    border_width 0, above 0x0, override NO

...


RRScreenChangeNotify event, serial 125, synthetic NO, window 0x4bc,
    root 0x4bc, timestamp 386328636, config_timestamp 386328813
    size_index 65535, subpixel_order SubPixelHorizontalRGB
    rotation RR_Rotate_0
    width 3840, height 1200, mwidth 1016, mheight 318

RRNotify event, serial 125, synthetic NO, window 0x4bc,
    subtype XRRCrtcChangeNotifyEvent
    crtc 79, mode 1920x1200, rotation RR_Rotate_0
    x 0, y 0, width 1920, height 1200

RRNotify event, serial 125, synthetic NO, window 0x4bc,
    subtype XRROutputChangeNotifyEvent
    output DisplayPort-0, crtc 79, mode 1920x1200 (1920x1200)
    rotation RR_Rotate_0
    connection RR_Connected, subpixel_order SubPixelHorizontalRGB

ConfigureNotify event, serial 125, synthetic NO, window 0x4bc,
    event 0x4bc, window 0x4bc, (0,0), width 3840, height 1200,
    border_width 0, above 0x0, override NO

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

In the middle of that mess, there is a RRScreenChangeNotify event with width
3840, which signifies the invalid desktop state that I get as the result of=
 the
problem - I've managed to smoke it out to xfsettingsd (part of the
xfce4-settings package) - it responds to the disconnection by disabling the
CRTC, and then when it reappears, it enables it without a clue of what the
monitor is, despite it being described in the xfconf settings - and therefo=
re
not putting it in the right place again.

xfsettingsd's version of the events:

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D

Gtk-Message: GtkDialog mapped without a transient parent. This is discourag=
ed.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 80.
xfce4-settings(displays): Detected CRTC 79.
xfce4-settings(displays): Detected CRTC 81.
xfce4-settings(displays): Detected CRTC 82.
xfce4-settings(displays): Detected CRTC 83.
xfce4-settings(displays): Detected CRTC 84.
xfce4-settings(displays): Detected output 85 DisplayPort-0.
xfce4-settings(displays): Detected output 86 HDMI-0.
xfce4-settings(displays): Detected output 88 DVI-1.
xfce4-settings(displays): Noutput: before =3D 3, after =3D 3.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 80.
xfce4-settings(displays): Detected CRTC 79.
xfce4-settings(displays): Detected CRTC 81.
xfce4-settings(displays): Detected CRTC 82.
xfce4-settings(displays): Detected CRTC 83.
xfce4-settings(displays): Detected CRTC 84.
xfce4-settings(displays): Detected output 85 DisplayPort-0.
xfce4-settings(displays): Detected output 86 HDMI-0.
xfce4-settings(displays): Detected output 88 DVI-1.
xfce4-settings(displays): Noutput: before =3D 3, after =3D 3.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 80.
xfce4-settings(displays): Detected CRTC 79.
xfce4-settings(displays): Detected CRTC 81.
xfce4-settings(displays): Detected CRTC 82.
xfce4-settings(displays): Detected CRTC 83.
xfce4-settings(displays): Detected CRTC 84.
xfce4-settings(displays): Detected output 86 HDMI-0.
xfce4-settings(displays): Detected output 88 DVI-1.
xfce4-settings(displays): Noutput: before =3D 3, after =3D 2.
xfce4-settings(displays): Output disconnected: DisplayPort-0
xfce4-settings(displays): Disabling CRTC 79.
xfce4-settings(displays): Normalized CRTC 80: size=3D1920x1200, pos=3D0x0.
xfce4-settings(displays): Normalized CRTC 81: size=3D1920x1200, pos=3D1920x=
0.
xfce4-settings(displays): min_h =3D 200, min_w =3D 320, max_h =3D 16384, ma=
x_w =3D
16384, prev_h =3D 1200, prev_w =3D 5760, prev_hmm =3D 318, prev_wmm =3D 152=
4, h =3D 1200,
w =3D 3840, hmm =3D 318, wmm =3D 1016.
xfce4-settings(displays): Applying desktop dimensions: 3840x1200 (px), 1016=
x318
(mm).
xfce4-settings(displays): Configuring CRTC 80.
xfce4-settings(displays): Configuring CRTC 79.
xfce4-settings(displays): Configuring CRTC 81.
xfce4-settings(displays): Configuring CRTC 82.
xfce4-settings(displays): Configuring CRTC 83.
xfce4-settings(displays): Configuring CRTC 84.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 80.
xfce4-settings(displays): Detected CRTC 79.
xfce4-settings(displays): Detected CRTC 81.
xfce4-settings(displays): Detected CRTC 82.
xfce4-settings(displays): Detected CRTC 83.
xfce4-settings(displays): Detected CRTC 84.
xfce4-settings(displays): Detected output 85 DisplayPort-0.
xfce4-settings(displays): Detected output 86 HDMI-0.
xfce4-settings(displays): Detected output 88 DVI-1.
xfce4-settings(displays): Noutput: before =3D 2, after =3D 3.
xfce4-settings(displays): New output connected: DisplayPort-0
xfce4-settings(displays): enabling crtc for DisplayPort-0
xfce4-settings(displays): CRTC 79 assigned to DisplayPort-0.
xfce4-settings(displays): CRTC 79, output list[0] -> 85.
xfce4-settings(displays): Normalized CRTC 80: size=3D1920x1200, pos=3D0x0.
xfce4-settings(displays): Normalized CRTC 79: size=3D1920x1200, pos=3D0x0.
xfce4-settings(displays): Normalized CRTC 81: size=3D1920x1200, pos=3D1920x=
0.
xfce4-settings(displays): min_h =3D 200, min_w =3D 320, max_h =3D 16384, ma=
x_w =3D
16384, prev_h =3D 1200, prev_w =3D 5760, prev_hmm =3D 318, prev_wmm =3D 152=
4, h =3D 1200,
w =3D 3840, hmm =3D 318, wmm =3D 1016.
xfce4-settings(displays): Applying desktop dimensions: 3840x1200 (px), 1016=
x318
(mm).
xfce4-settings(displays): Configuring CRTC 80.
xfce4-settings(displays): Configuring CRTC 79.
xfce4-settings(displays): Applying changes to CRTC 79.
xfce4-settings(displays): Configuring CRTC 81.
xfce4-settings(displays): Configuring CRTC 82.
xfce4-settings(displays): Configuring CRTC 83.
xfce4-settings(displays): Configuring CRTC 84.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 80.
xfce4-settings(displays): Detected CRTC 79.
xfce4-settings(displays): Detected CRTC 81.
xfce4-settings(displays): Detected CRTC 82.
xfce4-settings(displays): Detected CRTC 83.
xfce4-settings(displays): Detected CRTC 84.
xfce4-settings(displays): Detected output 85 DisplayPort-0.
xfce4-settings(displays): Detected output 86 HDMI-0.
xfce4-settings(displays): Detected output 88 DVI-1.
xfce4-settings(displays): Noutput: before =3D 3, after =3D 3.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 80.
xfce4-settings(displays): Detected CRTC 79.
xfce4-settings(displays): Detected CRTC 81.
xfce4-settings(displays): Detected CRTC 82.
xfce4-settings(displays): Detected CRTC 83.
xfce4-settings(displays): Detected CRTC 84.
xfce4-settings(displays): Detected output 85 DisplayPort-0.
xfce4-settings(displays): Detected output 86 HDMI-0.
xfce4-settings(displays): Detected output 88 DVI-1.
xfce4-settings(displays): Noutput: before =3D 3, after =3D 3.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 80.
xfce4-settings(displays): Detected CRTC 79.
xfce4-settings(displays): Detected CRTC 81.
xfce4-settings(displays): Detected CRTC 82.
xfce4-settings(displays): Detected CRTC 83.
xfce4-settings(displays): Detected CRTC 84.
xfce4-settings(displays): Detected output 85 DisplayPort-0.
xfce4-settings(displays): Detected output 86 HDMI-0.
xfce4-settings(displays): Detected output 88 DVI-1.
xfce4-settings(displays): Noutput: before =3D 3, after =3D 3.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D

I'm assuming the important part from the X perspective is when
xfsettingsd/displays.c:xfce_displays_helper_screen_on_event realises the
display is Disconnected, and runs xfce_displays_helper_disable_crtc which c=
alls
XRRSetCrtcConfig with RRCrtc->mode of None/NULL.

If the daemon is killed, no reconfiguration occurs and the desktop keeps its
correct configuration - presumably at the X level its just treated like a
monitor powering off and on - so I guess the next step is for me to underst=
and
what is causing the Disconnect event to be fired through the stack, since t=
he
monitor is definitely not disconnected in reality.

Kudos to Michel for the guess earlier.

--=20
You are receiving this mail because:
You are the assignee for the bug.=

--15177686901.4Ae8.21396
Date: Sun, 4 Feb 2018 18:24:50 +0000
MIME-Version: 1.0
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
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Auto-Submitted: auto-generated

<html>
    <head>
      <base href=3D"https://bugs.freedesktop.org/">
    </head>
    <body>
      <p>
        <div>
            <b><a class=3D"bz_bug_link=20
          bz_status_NEW "
   title=3D"NEW - 'flip queue failed in radeon_scanout_flip: Invalid argume=
nt' error and small frame buffer allocated on turning off and on new monito=
r"
   href=3D"https://bugs.freedesktop.org/show_bug.cgi?id=3D100289#c14">Comme=
nt # 14</a>
              on <a class=3D"bz_bug_link=20
          bz_status_NEW "
   title=3D"NEW - 'flip queue failed in radeon_scanout_flip: Invalid argume=
nt' error and small frame buffer allocated on turning off and on new monito=
r"
   href=3D"https://bugs.freedesktop.org/show_bug.cgi?id=3D100289">bug 10028=
9</a>
              from <span class=3D"vcard"><a class=3D"email" href=3D"mailto:=
OmegaPhil&#64;startmail.com" title=3D"OmegaPhil&#64;startmail.com">OmegaPhi=
l&#64;startmail.com</a>
</span></b>
        <pre>After messing around with this on and off for months, I have f=
ound that the
radeon_scanout_flip error is irrelevant - when the third monitor is turned =
off
and on, sometimes DisplayPort-0 is reported as Disconnected and then Connec=
ted
- through monitoring the root window (xev -root), I can finally get into a
useful X events stream:

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

RRScreenChangeNotify event, serial 114, synthetic NO, window 0x4bc,
    root 0x4bc, timestamp 332828415, config_timestamp 386328254
    size_index 65535, subpixel_order SubPixelHorizontalRGB
    rotation RR_Rotate_0
    width 5760, height 1200, mwidth 1526, mheight 318

RRNotify event, serial 114, synthetic NO, window 0x4bc,
    subtype XRROutputChangeNotifyEvent
    output DisplayPort-0, crtc 79, mode 1920x1200 (1920x1200)
    rotation RR_Rotate_0
    connection RR_Disconnected, subpixel_order SubPixelHorizontalRGB

RRScreenChangeNotify event, serial 115, synthetic NO, window 0x4bc,
    root 0x4bc, timestamp 332828415, config_timestamp 386328254
    size_index 65535, subpixel_order SubPixelHorizontalRGB
    rotation RR_Rotate_0
    width 5760, height 1200, mwidth 1526, mheight 318

RRNotify event, serial 115, synthetic NO, window 0x4bc,
    subtype XRRCrtcChangeNotifyEvent
    crtc 79, mode None, rotation RR_Rotate_0
    x 0, y 0, width 0, height 0

RRNotify event, serial 115, synthetic NO, window 0x4bc,
    subtype XRROutputChangeNotifyEvent
    output DisplayPort-0, crtc None, mode None
    rotation RR_Rotate_0
    connection RR_Disconnected, subpixel_order SubPixelHorizontalRGB

ConfigureNotify event, serial 115, synthetic NO, window 0x4bc,
    event 0x4bc, window 0x4bc, (0,0), width 5760, height 1200,
    border_width 0, above 0x0, override NO

RRScreenChangeNotify event, serial 117, synthetic NO, window 0x4bc,
    root 0x4bc, timestamp 386328636, config_timestamp 386328813
    size_index 65535, subpixel_order SubPixelHorizontalRGB
    rotation RR_Rotate_0
    width 5760, height 1200, mwidth 1526, mheight 318

RRNotify event, serial 117, synthetic NO, window 0x4bc,
    subtype XRROutputChangeNotifyEvent
    output DisplayPort-0, crtc None, mode None
    rotation RR_Rotate_0
    connection RR_Connected, subpixel_order SubPixelHorizontalRGB

RRScreenChangeNotify event, serial 117, synthetic NO, window 0x4bc,
    root 0x4bc, timestamp 386328636, config_timestamp 386328813
    size_index 65535, subpixel_order SubPixelHorizontalRGB
    rotation RR_Rotate_0
    width 3840, height 1200, mwidth 1016, mheight 318

ConfigureNotify event, serial 117, synthetic NO, window 0x4bc,
    event 0x4bc, window 0x4bc, (0,0), width 3840, height 1200,
    border_width 0, above 0x0, override NO

...


RRScreenChangeNotify event, serial 125, synthetic NO, window 0x4bc,
    root 0x4bc, timestamp 386328636, config_timestamp 386328813
    size_index 65535, subpixel_order SubPixelHorizontalRGB
    rotation RR_Rotate_0
    width 3840, height 1200, mwidth 1016, mheight 318

RRNotify event, serial 125, synthetic NO, window 0x4bc,
    subtype XRRCrtcChangeNotifyEvent
    crtc 79, mode 1920x1200, rotation RR_Rotate_0
    x 0, y 0, width 1920, height 1200

RRNotify event, serial 125, synthetic NO, window 0x4bc,
    subtype XRROutputChangeNotifyEvent
    output DisplayPort-0, crtc 79, mode 1920x1200 (1920x1200)
    rotation RR_Rotate_0
    connection RR_Connected, subpixel_order SubPixelHorizontalRGB

ConfigureNotify event, serial 125, synthetic NO, window 0x4bc,
    event 0x4bc, window 0x4bc, (0,0), width 3840, height 1200,
    border_width 0, above 0x0, override NO

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

In the middle of that mess, there is a RRScreenChangeNotify event with width
3840, which signifies the invalid desktop state that I get as the result of=
 the
problem - I've managed to smoke it out to xfsettingsd (part of the
xfce4-settings package) - it responds to the disconnection by disabling the
CRTC, and then when it reappears, it enables it without a clue of what the
monitor is, despite it being described in the xfconf settings - and therefo=
re
not putting it in the right place again.

xfsettingsd's version of the events:

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D

Gtk-Message: GtkDialog mapped without a transient parent. This is discourag=
ed.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 80.
xfce4-settings(displays): Detected CRTC 79.
xfce4-settings(displays): Detected CRTC 81.
xfce4-settings(displays): Detected CRTC 82.
xfce4-settings(displays): Detected CRTC 83.
xfce4-settings(displays): Detected CRTC 84.
xfce4-settings(displays): Detected output 85 DisplayPort-0.
xfce4-settings(displays): Detected output 86 HDMI-0.
xfce4-settings(displays): Detected output 88 DVI-1.
xfce4-settings(displays): Noutput: before =3D 3, after =3D 3.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 80.
xfce4-settings(displays): Detected CRTC 79.
xfce4-settings(displays): Detected CRTC 81.
xfce4-settings(displays): Detected CRTC 82.
xfce4-settings(displays): Detected CRTC 83.
xfce4-settings(displays): Detected CRTC 84.
xfce4-settings(displays): Detected output 85 DisplayPort-0.
xfce4-settings(displays): Detected output 86 HDMI-0.
xfce4-settings(displays): Detected output 88 DVI-1.
xfce4-settings(displays): Noutput: before =3D 3, after =3D 3.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 80.
xfce4-settings(displays): Detected CRTC 79.
xfce4-settings(displays): Detected CRTC 81.
xfce4-settings(displays): Detected CRTC 82.
xfce4-settings(displays): Detected CRTC 83.
xfce4-settings(displays): Detected CRTC 84.
xfce4-settings(displays): Detected output 86 HDMI-0.
xfce4-settings(displays): Detected output 88 DVI-1.
xfce4-settings(displays): Noutput: before =3D 3, after =3D 2.
xfce4-settings(displays): Output disconnected: DisplayPort-0
xfce4-settings(displays): Disabling CRTC 79.
xfce4-settings(displays): Normalized CRTC 80: size=3D1920x1200, pos=3D0x0.
xfce4-settings(displays): Normalized CRTC 81: size=3D1920x1200, pos=3D1920x=
0.
xfce4-settings(displays): min_h =3D 200, min_w =3D 320, max_h =3D 16384, ma=
x_w =3D
16384, prev_h =3D 1200, prev_w =3D 5760, prev_hmm =3D 318, prev_wmm =3D 152=
4, h =3D 1200,
w =3D 3840, hmm =3D 318, wmm =3D 1016.
xfce4-settings(displays): Applying desktop dimensions: 3840x1200 (px), 1016=
x318
(mm).
xfce4-settings(displays): Configuring CRTC 80.
xfce4-settings(displays): Configuring CRTC 79.
xfce4-settings(displays): Configuring CRTC 81.
xfce4-settings(displays): Configuring CRTC 82.
xfce4-settings(displays): Configuring CRTC 83.
xfce4-settings(displays): Configuring CRTC 84.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 80.
xfce4-settings(displays): Detected CRTC 79.
xfce4-settings(displays): Detected CRTC 81.
xfce4-settings(displays): Detected CRTC 82.
xfce4-settings(displays): Detected CRTC 83.
xfce4-settings(displays): Detected CRTC 84.
xfce4-settings(displays): Detected output 85 DisplayPort-0.
xfce4-settings(displays): Detected output 86 HDMI-0.
xfce4-settings(displays): Detected output 88 DVI-1.
xfce4-settings(displays): Noutput: before =3D 2, after =3D 3.
xfce4-settings(displays): New output connected: DisplayPort-0
xfce4-settings(displays): enabling crtc for DisplayPort-0
xfce4-settings(displays): CRTC 79 assigned to DisplayPort-0.
xfce4-settings(displays): CRTC 79, output list[0] -&gt; 85.
xfce4-settings(displays): Normalized CRTC 80: size=3D1920x1200, pos=3D0x0.
xfce4-settings(displays): Normalized CRTC 79: size=3D1920x1200, pos=3D0x0.
xfce4-settings(displays): Normalized CRTC 81: size=3D1920x1200, pos=3D1920x=
0.
xfce4-settings(displays): min_h =3D 200, min_w =3D 320, max_h =3D 16384, ma=
x_w =3D
16384, prev_h =3D 1200, prev_w =3D 5760, prev_hmm =3D 318, prev_wmm =3D 152=
4, h =3D 1200,
w =3D 3840, hmm =3D 318, wmm =3D 1016.
xfce4-settings(displays): Applying desktop dimensions: 3840x1200 (px), 1016=
x318
(mm).
xfce4-settings(displays): Configuring CRTC 80.
xfce4-settings(displays): Configuring CRTC 79.
xfce4-settings(displays): Applying changes to CRTC 79.
xfce4-settings(displays): Configuring CRTC 81.
xfce4-settings(displays): Configuring CRTC 82.
xfce4-settings(displays): Configuring CRTC 83.
xfce4-settings(displays): Configuring CRTC 84.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 80.
xfce4-settings(displays): Detected CRTC 79.
xfce4-settings(displays): Detected CRTC 81.
xfce4-settings(displays): Detected CRTC 82.
xfce4-settings(displays): Detected CRTC 83.
xfce4-settings(displays): Detected CRTC 84.
xfce4-settings(displays): Detected output 85 DisplayPort-0.
xfce4-settings(displays): Detected output 86 HDMI-0.
xfce4-settings(displays): Detected output 88 DVI-1.
xfce4-settings(displays): Noutput: before =3D 3, after =3D 3.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 80.
xfce4-settings(displays): Detected CRTC 79.
xfce4-settings(displays): Detected CRTC 81.
xfce4-settings(displays): Detected CRTC 82.
xfce4-settings(displays): Detected CRTC 83.
xfce4-settings(displays): Detected CRTC 84.
xfce4-settings(displays): Detected output 85 DisplayPort-0.
xfce4-settings(displays): Detected output 86 HDMI-0.
xfce4-settings(displays): Detected output 88 DVI-1.
xfce4-settings(displays): Noutput: before =3D 3, after =3D 3.
xfce4-settings(displays): RRScreenChangeNotify event received.
xfce4-settings(displays): Refreshing RandR cache.
xfce4-settings(displays): Detected CRTC 80.
xfce4-settings(displays): Detected CRTC 79.
xfce4-settings(displays): Detected CRTC 81.
xfce4-settings(displays): Detected CRTC 82.
xfce4-settings(displays): Detected CRTC 83.
xfce4-settings(displays): Detected CRTC 84.
xfce4-settings(displays): Detected output 85 DisplayPort-0.
xfce4-settings(displays): Detected output 86 HDMI-0.
xfce4-settings(displays): Detected output 88 DVI-1.
xfce4-settings(displays): Noutput: before =3D 3, after =3D 3.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D

I'm assuming the important part from the X perspective is when
xfsettingsd/displays.c:xfce_displays_helper_screen_on_event realises the
display is Disconnected, and runs xfce_displays_helper_disable_crtc which c=
alls
XRRSetCrtcConfig with RRCrtc-&gt;mode of None/NULL.

If the daemon is killed, no reconfiguration occurs and the desktop keeps its
correct configuration - presumably at the X level its just treated like a
monitor powering off and on - so I guess the next step is for me to underst=
and
what is causing the Disconnect event to be fired through the stack, since t=
he
monitor is definitely not disconnected in reality.

Kudos to Michel for the guess earlier.</pre>
        </div>
      </p>


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